OO question

[Paddy]

fejkadress at hushmail.com wrote:

> I want to make an addressbook and I'm new to OO programming, so I
> wonder if this sounds reasonable.
>
> I think of making a class Address which contains all data about one
> person, that class can have UserDict as baseclass so I can access data
In Python 2.4 or 2.5 you can subclass dict.

> like object['name'], etc..
> Then maybe I can have a class AddressBook which has a list that
> contains all those Address objects.
> Does that sound reasonable?
Yep.

class AdressBook(list):
  def save(self, filename):
    import pickle
    ...


> And then the real reason that I posted here is:
> If I want to save all addresses to disk, I can have a method, say,
> save() of AddressBook. But then what? What is a good object oriented
> approach? Should each Address object take care of saving itself to the
> file, with a method like writetofile(filename), or should the class
> AddressBook take care of the saving and ask each object for its data?
If you use the pickle module on the Addressbook then it will
automatically
save each Address instance.

- Paddy.